Heterocyclic magenta dye-forming couplers
US4338393A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1981 |
| Grant date | Jul 6, 1982 |
| Priority date | — |
| Expiry date | Feb 4, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C7/3825
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Photographic magenta dye-forming couplers have the general formula: ##STR1## wherein: A represents the atoms necessary to complete, with the nitrogen atom to which it is attached, a magenta dye-forming coupler moiety whose coupling position is inactivated by the --CHR.sup.1 R.sup.2 group; PA0 CHR.sup.1 R.sup.2 is a blocking group which, upon reaction with oxidized color developing agent, is detached from the coupler moiety to yield a mobile reaction product; PA0 R.sup.1 is alkyl--O--CO--, alkyl--CO--, aryl--O--CO--, aryl--CO--, --COOH, --NO.sub.2 or --CN and PA0 R.sup.2 is a group specified for R.sup.1 or aryl--NHCO--. These couplers can be incorporated in photographic elements, emulsions and processing compositions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.